Control apparatus



Nov. 7, 1967 w. F. ALLINGHAM 3,351,085

CONTROL APPARATUS Filed July 12, 1965 3 Sheets-Sheet 1 ON OFF OPERATORINVENTOR.

WALTER -E ALLINGHAM.

JTTOP/Vfy Nov. 7, 1967 w. F. ALLINGHAM 3,351,085

CONTROL APPARATUS Filed Jul 12, 1965 3 Sheets-Sheet 2 @1111"; 1};Ld'PosmoN 3 I N VEN TOR.

WALTER F ALUNGHAM BY Filed July 12, 1965 Nov. 7, 1967 w. F. ALLINGHAM3,351,085

CONTROL APPARATUS 3 Sheets-Sheet .3

INVENTOR WALTER E ALLINGHAM Jaw/ 6 ATTORNEY United States Patent3,351,085 CONTROL APPARATUS Waiter F. Allingham, Torrance, Calif.,assignor to Honeywell Inc., Minneapolis, Minn., a corporation ofDelaware Filed .luly 12, 1965, Ser. No. 471,347 17 Claims. (Cl. 137-495)This invention relates to control apparatus and more particularly to apressure responsive modulating control valve. Specifically, theinvention relates to a pressure responsive exhaust valve for use incontrolling a main valve of the type having a main closure member whichis operated in response to the pressure in a pressure chamber under thecontrol of the exhaust valve, and wherein the exhaust valve is operatedin response to the pressure at the outlet of the main valve so that themain valve is operated to maintain a substantially uniform outletpressure therefrom. The exhaust valve includes further pressure operatedmeans and time delay means associated therewith which is effective, apredetermined time after pressure is initially supplied to the valve, tovary the loading on the pressure responsive exhaust valve so that theexhaust valve then operates only in response to a substantially greaterpressure than that to which it initially responds. This causes the mainvalve to open initially to a minimum flow position and then, after atime delay, to open to a full flow position and to provide outletpressure regulation at each of the flow levels.

The invention also provides means for selectively adjusting the minimumand full flow operating levels of the valve. Further, the inventioncontemplates the utilization, with the structure discussed above, of amanually operable means selectively operable to render the pressureresponsive additional loading means inoperative so that the valve willcontinuously respond to the relatively low pressure.

My modulating exhaust valve is particularly useful in connection with aservo valve system wherein the main valve is operated by a movable wallwhich is responsive to fluid pressure in a main control or pressurechamber and wherein there is provided a first fluid passage be tween theinlet and the pressure chamber, a second fluid passage between thepressure chamber and the outlet, a two position valve in one of thepassages and my exhaust valve in the other. The exhaust valve isconnected so that it is operated by outlet pressure to maintain auniform pressure at the outlet of the main valve. The further pressureoperated means is connected either to the outlet or to the pressurechamber of the main valve so that, a predetermined time after the mainvalve opens, the exhaust valve is additionally loaded so that the valveoperates at a greater pressure.

Various objects and advantages of my invention will become apparent uponreading the following detailed description of two preferred embodimentsthereof wherein reference is made to the accompanying drawing. In thedrawing:

FIGURE 1 is a schematic representation of a servo-type valve utilizing,as one of the controllers or pilot valves therefor, a modulating exhaustvalve constructed according to my invention.

FIGURE 2 is a plan view of the interior of an exhaust valve constructedaccording to my invention and including a high-low selector member.

FIGURE 3 is a crosssectional view taken generally along line 3-3 ofFIGURE 2.

FIGURE 4 discloses schematically the exhaust valve of my inventionmodified with another type of high-low selector apparatus.

FIGURE 5 discloses an exhaust valve constructed according to anotherform of my invention.

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FIGURE 6 is a longitudinal cross-sectional view taken generally alongline 6--6 of FIGURE 5.

FIGURE 1 discloses a servo-type pressure regulator valve which utilizesa modulating exhaust valve constructed according to my invention as apilot valve to control the position of the main valve. While myinvention lies in the construction of the pressure operated modulatingexhaust valve, it is believed necessary, in order to properly disclosemy invention, to describe one environment in which it has utility. InFIGURE 1, reference numeral 10 generally designates the servo-typepressure regulator. This regulator includes a main valve portion 11, atwo position servo control valve 12 and a modulating pressure responsiveservo valve 13, the latter being constructed according to my invention.Main valve 11 has an inlet 14 and an outlet 15 separated by a wall 16having an aperture 17 formed therethrough. Cooperable with aperture 17is a main valve closure member 20 which is operably connected to adiaphragm or other movable wall 21 which separates the body of the mainvalve, on the outlet side of wall 16, into an outlet chamber 22 and apressure or control chamber 23. A spring 24 urges diaphragm 21 towardchamber 23 and closure member 20 to a closed position. Between inlet 14and wall 16 is an inlet chamber 25 which may have a manually operablevalve 26 disposed therein. This manual valve may be a conventional diskor plug type valve with any appropriate manual operator (not shown).Manual valve 26 may also control flow through a passage 27 whichby-passes the main valve closure member and is adapted to be connectedto a pilot burner (not shown).

A passage 30, which may include a flow restriction 31, connects inletchamber 25 to the interior of the two position control valve 12. Afurther passage 32 connects the interior of control valve 12 to pressurechamber 23. A passage 33 in control valve 12 connects to a main chamber34 in the control valve which in turn is: connected, by a passage 35, tooutlet chamber 22 of the main valve. A valve closure member 36 isoperably connected to an on-off type operator 37 in control valve 12 andhas a normal position wherein passage 30 is closed 017 and passages 32and 33 are connected. In this normal position, pressure chamber 23 isconnected to outlet chamber 22 and hence is exhausted. When the operator37 is energized, the valve closure member 36 blocks passage 33 and openspassage 30 so that the pressure chamber 23 of the main valve isconnected to inlet chamber 25 and this inlet pressure is sufiicient toovercome the bias of spring 24 and to open the main value closure member20.

When control valve 12 is open to supply inlet pressure to the pressurechamber 23, the amount of fluid pressure in chamber 23, and consequentlythe position of the main valve closure member 20, is controlled by themodulating exhaust valve .13. For the sake of clarity, modulating valve13 is shown somewhat schematically in FIGURE 1 but is shown morerealistically in FIGURES 2 and 3. Valve 13 has a main body portion 40which has an opening 40a therethrough extending from top to bottom. Thebottom of this opening is covered by a first movable wall such as adiaphragm 41 which is sealed between the bottom of body member 40 andthe upper surface of another body member 42. The upper end of bodymember 40 is closed by a second movable wall such as a diaphragm 43which has its periphery clamped between the upper end of body member 40and the lower end of a further body member 44. Intermediate body member42 and the under surface of diaphragm 41 is an operating chamber 45 andintermediate body member 44 and the upper surface of diaphragm 43 is atiming chamber 46. Thus, diaphragms 41 and 43 will be referred to as anoperating diaphragm and a timing diaphragm, respectively. Formed in bodymember 42 is a chamber 47 which is connected to pressure chamber 23 ofthe main valve by a passage 48. Chamber 47 is connected to operatingchamber 45 by a port 50. Disposed in chamber 45 and cooperable with port50 to control fluid flow therethrough, is a spherical valve closuremember 51 which is normally urged into closing engagement with port 50by operating diaphragm 41. Timing chamber 46 is connected to chamber 47by a passage 52 which has a time delay flow restriction 53 disposedtherein.

The opening 40a in body member 40, intermediate diaphragms 41 and 43, ispreferably connected to atmosphere by a restricted passage 54.cantilevered in body member 40, as at 55, is a pair of lever members 56and 57 which are bent so that they extend in generally spaced parallelrelationship across the interior of body member 40 and generallyparallel to diaphragms 41 and 43. Levers 56 and 57 have alignedapertures 60 and 61 respectively. At their free ends levers 56 and 57have tab portions 62 and 63, respectively, which are bent to form anacute angle with the lever members. These tabs are engaged by theconical end of adjustment screws 64 and 65. Advancement of adjustmentscrew 65 will result in deflecting the free end of lever 57 downwardlyand advancement of adjustment screw 64 will result in deflecting thefree end of lever 56 upwardly. Thus, these adjustment screws provide ameans for selectively adjusting the position of the two lever memberswith respect to each other and also with respect to diaphragm 41.Ent-rapped between levers 56 and 57 is a spring engaging member 66 whichhas cylindrical body portion 67 and an outwardly extending annularflange 68. Flange 68 is of a diameter sufficiently-large so that itcannot pass through the apertures 61) and 61 of the levers, butcylindrical portion 67 is sufficiently small in diameter to extendthrough aperture 61 in lever 57.

Disposed between operating diaphragm 41 and spring engaging member 66 isa first loading spring 70 which urges diaphragm 41 in a direction toclose valve closure member 51 against port 50 and also urge-s springengaging member 66 to a position so that flange 68 engages the undersideof lever 57. Disposed between diaphragm 43 and the upper surface offlange 68 is another spring 71 which is of substantially negligiblestrength with respect to the strength of spring 70, but which issufficiently strong to normally lift diaphragm 43 away from the upperend of spring engaging member 66 when timing chamber 46 is evacuated. Itwill be noted that the loading applied to diaphragm 41 by spring 70(with diaphragm 43 held away from spring engaging member 66) isdetermined by the position of lever 57 which is in turn determined bythe position of adjustment member 65.

' As will be seen hereinafter, when a description of the operation ofthe regulating valve is given, under certain circumstances pressurebuilds up in timing chamber 46 and forces timing diaphragm 43 downwardlyand into engagement with the upper end of spring engaging member 66.Under these circumstances diaphragm 43 pushes the spring engaging memberdownwardly until flange 68 engages the upper surface of lever 56 andthus additionally loads operating diaphragm 41. The loading on diaphragm41, whenthis occurs, is determined by the position of lever 56 which inturn is determined by the position of adjustment member 64.

' The operation of the structure of FIGURE 1 will now be described. Withtwo position control valve 12 in its off position and valve closuremember 36 blocking passage 30, as disclosed in FIGURE 1, pressurechamber 23 is connected to outlet chamber 22 and main closure member 20is closed. At this time the pressure in outlet chamber 22 and inpressure chamber 23, as well as in operating and timing chambers 45 and46, is substantially at atmospheric since outlet of the valve isnormally connected to a burner (not shown). When it is desired to openthe main closure member 20, operator 37 of valve 12 is energized andvalve closure member 36 is shifted to a position so that it closes offpassage 33 and opens passage 30. This connects pressure chamber 23 toinlet chamber 25 and the inlet pressure is effective to overcome theforce of spring 24 and to open main valve closure member 20. This causesan increase in the pressure in outlet chamber 22 and in operatingchamber 45 which is connected to outlet chamber 22 by the substantiallyunrestricted passage 35. As soon as the pressure in chamber 45 issuflicient to overcome the loading on operating diaphragm 41 by spring70, diaphragm 41 is lifted and valve 51 opens to allow pressure to beexhausted from chamber 47 (which is connected to pressure chamber 23)through passage 50 to outlet chamber 22. This tends to reduce thepressure in chamber 23 and thus to slightly close main closure member20. It will be seen that this arrangement will maintain a pressure inpressure chamber 23 which is sufficient to position main valve closuremember 20 so that it maintains a constant outlet pressure which isdetermined by the loading on diaphragm 41.

The pressure in chamber 47 gradually is communicated to timing chamber46 through passage 52 and the restriction 53. After a period of timedetermined by the size of restriction 53, the pressure in timing chamber46 is suflicient to move diaphragm 44 downwardly and to engage the upperend of spring engaging member 66. After a period of time this pressurebecomes sufficient to push member 66 downward until flange 68 engagesthe upper surface of lever 56. This additionally loads diaphragm 41 sothat a substantially greater pressure in outlet chamber 22 and operatingchamber 45 is necessary to lift valve 51. Thus, the valve system iscaused to regulate at a substantially increased outlet pressure.

The modulating exhaust valve with the pressure operated step feature isshown less schematically in FIGURES 2 and 3. These figures also disclosethe valve modified to I include manual means for rendering the diaphragm43 inoperative so that it will not additionally load operating diaphragm41 after the time delay if it is desired that the valve continuouslyoperate at the low or initial regulating level. This function isprovided by the addition of a shaft 75 rotatably mounted in body member40 and having one end extending beyond the outer edge of body 40 andfitted with an operating knob 76. Shaft 75 may be sealed with respect tobody member 46 by appropriate means such as an O-ring 77. Shaft 75 alsoextends into the interior of body member 40 and has mounted at itsinterior end an abutment arm 80. Abutment arm may be attached to the endof shaft 75 by any appropriate means, such as simply crimping over theend of the shaft as at 81. Abutment arm 80 includes a portion 86a whichextends generally perpendicular to shaft 75 and a portion 80b whichextends generally parallel to, and offset from, the axis of shaft 75.When it is desired that the valve regulate continuously at the low orinitial pressure level, knob 76 is rotated to a position wherein portionStlb of arm 86 physically engages the underside of timing diaphragm 43and restrains it from moving downward in response to a build up ofpressure in timing chamber 46. Thus, timing diaphragm 43 is ineffectiveto additionally load operating diaphragm 41 and the valve operatescontinuously at the low or initial pressure level whenever two positioncontrol valve 12 is energized.

When it is desired that the valve operate in its high position, knob 76is rotated so that portion 80b of abutment arm 80 is disposedintermediate diaphragms 41 and 43 so that it does not interfere with themovement of timing diaphragm 43. When this is done the operation of thevalve is identical to that described in connection with FIGURE 1. Inother words, the valve initially operates at a low or initial pressurelevel determined by the position of lever 57 and, after a time delaysufficient to allow a build up of pressure in timing chamber 46,diaphragm 43 moves downward and additionally loads the operatingdiaphragm so that the valve operates at a substantially greaterpressure.

Another way of obtaining this high-low operation is disclosedschematically in FIGURE 4 where modulating valve 13 is also disclosedschematically. In this arrangement, a passage 90 connects timing chamber46 to the interior of a two position valve 91 which has another passage92 which is connected to an area of low pressure such as an areaadjacent the fuel burner (not shown). Inside valve 91 is a valve closuremember 93 which may be manually or otherwise operated. When closuremember 93 is in its closed position, as shown in FIGURE 4, passage 90 isblocked off and the operation of timing chamber 46 and timing diaphragm43 is exactly as described in connection with FIGURES 1, 2 and 3.However, if valve closure member 93 is open so that passage 90 isconnected to passage 92, the pressure which normally would build up intiming chamber 46 is bled off to the burner and sufiicient pressure isnever applied to diaphragm 43 to move it down to additionally load theoperating diaphragm 41.

Another modulating exhaust valve constructed according to my invention,but diifering somewhat in the structural details thereof, is disclosedin FIGURES 5 and 6. In the following description of this embodiment ofmy invention, elements similar to, or corresponding to, elementsdisclosed in FIGURES 1 through 4 have been given identicalidentification numerals but preceded by the numeral 1. In other words,the main body portion of the exhaust valve was identified by the numeral40 in the preceding figures and in the embodiment disclosed in theFIGURES 5 and 6 it is identified by the numeral 140. These elementswhich do not have a substantial equivalent in FIGURES 1 through 4 willbe identified by numerals beginning with the numeral 200.

In this embodiment, body portions 140 and 142 have clamped therebetweenthe peripheral portion of an operating diaphragm 141 which is responsiveto pressure in an operating chamber 145. Operating diaphragm 141operably engages an exhaust valve closure member 151 which controls theflow of fluid through a port 150. A timing diaphragm 143 is clampedalong its periphery between body members 140 and 144 and there is formedbetween diaphragm 143 and body member 144 a timing chamber 146. Betweendiaphragms 141 and 143 is a chamber 140a which is preferably connectedto atmosphere by a passage (not shown).

Cantilevered in chamber 140a is a first lever member 157 which may beattached to body member 140 by appropriate means such as rivets 155.Lever 157 has a portion extending generally parallel to the operatingand timing diaphragms and is sufiiciently resilient so that its free endmay be deflected toward and away from operating diaphragm 141. Anadjustment member 165 is threaded into body member 140 and engages anabutment tab 200 on the free end of lever 157 to deflect lever 157toward diaphragm 141. Member 165 is thus selectively movable todetermine the position of the free end of lever 157 in a direction awayfrom operating diaphragm 141.

Lever 157 has, adjacent its fixed end, a pair of hooklike members 201which cooperate with a corresponding pair of tabs 202 on a second levermember 156 and act as a pivot for lever 156 with respect to lever 157.Lever 156 has a free end which extends generally to about the sameextent as does the free end of lever 157. Adjacent their free ends,levers 156 and 157 have a pair of coop crating tabs 203 and 204,respectively, which limit the amount of movement of the free end oflever 156 away from the free end of lever 157. Lever 156 has at its freeend three abutment tabs, 205, 206 and 207. Tabs 205 and 207 cooperatewith a movable adjustment member 164 and a fixed abutment member 208,respectively. Adjustment member 208 is press-fitted into body member 140and cannot be moved once it has been forced into the body. This memberprovides a factory adjustment which limits the pivotal movement of lever156 toward operating diaphragm 141. Adjustment member 164 provides afield adjustable limit of the pivotal movement of member 156 towardsoperating diaphragm 141. Tab 206 on lever 156 cooperates with anabutment surface 210 which is an integral part of body member and.provides an absolute limiting position of the free end of lever 156 withrespect to operating diaphragm 141 irregardless of the adjustmentmembers 164 and 208. Similarly, lever 157 has adjacent its free end anabutment tab 211 which cooperates with an abutment portion 212 on bodymember 140 to limit the displacement of the free end of lever 157 in adirection away from operating diaphragm 141.

Lever member 156 has formed therein a portion 166 which acts as a springengaging member or portion which engages one end of a loading spring170, the other end of which acts upon operating diaphragm 141 and urgesit to a position wherein it closes exhaust valve closure member 151against passage 150. A substantially lighter spring 171 acts between theupper surface of lever 156 and the under surface of timing diaphragm 143and normally maintains timing diaphragm 143 out of engagement with lever156.

The operation of this embodiment of my invention is substantially thesame as that discussed in connection with the previous figures. Timingchamber 146 is connected by a restricted passage, such as passage 152,to an area which is normally at a pressure insufficient to cause timingdiaphragm 143 to move down in opposition to the bias of spring 1'71 butwhich area is supplied with a higher pressure when the main valve isoperated to an open position and pressure is supplied to the area towhich passage 150 is connected. Spring normally urges diaphragm 141 to.a position wherein it closes valve closure member 151, and it urgeslever 156 in a clockwise direction so that abutment tab 263 thereonengages the underside of abutment tab 2114 on lever 157. The positionor" the free end of lever 157 is determined by the adjustment of member165. This corresponds to a minimum loading condition for diaphragm 141.Upon initial application of pressure to the valve, operating diaphragm141 responds to a relatively low pressure corresponding to this minimumloading condition. As pressure builds up in timing chamber 146, timingdiaphragm 143 is driven downwardly so that it engages lever 156 andmoves it in a counterclockwise direc tion to compress loading spring170. The amount of movement which lever 156 can make is determined bythe position of adjustment member 164 which will thus determine themaximum loading condition of the operating diaphragm. When the operatingdiaphragm is so loaded, the valve responds only to a substantiallygreater pressure.

It will be appreciated that means for providing highlow selection forthe operation of the valve may be provided by simply adding to thestructure disclosed in FIG- URES 5 and 6 the high-low selector apparatusdisclosed in FIGURES 2 and 3 or that disclosed in FIGURE 4.

I have described certain preferred embodiment of my invention and oneenvironment in which it finds utility. From this description it can beseen that my invention provides a simple, reliable modulating exhaustvalve for controlling a main pressure operated valve. The structureincludes pressure operated means for varying the loading on the exhaustvalve a predetermined time after initial operation of the valve to causethe exhaust valve to then regulate at a substantially greater pressure.In addition, I have provided means whereby this stepping function may beselectively manually overridden so that the valve will operate only atthe lower pressure if this operation is desired. In view of thisdisclosure of these particular preferred embodiments of my invention,various modifications may be apparent to those skilled in the artwithout departing from the scope of my invention. For this reason it isto be understood that the description herein is by way of example onlyand my invention is to be limited solely by the scope of the appendedclaims.

I claim:

1. A pressure responsive exhaust valve for use in controlling a mainvalve of the type having a main closure member biased to a closedposition, a control chamber including a movable wall operably connectedto the main closure member and responsive to pressure in the controlchamber to open the closure member, and control valve means operable toa first position to connect the control chamber to pressure at the inletof the main valve to cause opening of the main closure member, andoperable to a second position to connect the control chamber to theoutlet of the main valve to cause closure of the main closure member,the exhaust valve comprising: a body having a void therein; a pair ofspaced, generally parallel diaphragms disposed in said void and dividingit into an operating chamber between the first of said diaphragms andsaid body and a timing chamber between the second of said diaphragms andsaid body, and a central chamber intermediate said diaphragms; firstfluid passage means including a flow restriction and connecting saidcentral chamber to atmosphere; second fluid passage means adapted toconnect said operating chamber to the outlet of the main valve; thirdfluid passage means adapted to connect said operating chamber to thecontrol chamber; an exhaust valve closure means cooperable with saidthird fluid passage to control fluid flow therethrough, said closuremember being operably engaged by said first diaphragm and normally urgedthereby to a position to close said third passage means, said firstdiaphragm being responsive to fluid pressure in said operating chamberfor movement toward said central chamber to allow said closure member toopen said third passage means; a pair of spaced generally parallel levermembers cantilevered on said body in said central chamber and extendinggenerally parallel to said diaphragms, said levers having a pair ofaligned apertures thereth-rough, each of said levers having acalibration tab extending therefrom at an acute angle to said levers; afirst adjustment member threaded into said body and extending into saidcentral chamber generally parallel to said levers and engaging thecalibration tab on the first of said levers so that said adjustmentmember may be selectively manipulated to deflect said first lever towardor away from the second of said levers; a second adjustment member,similar to said first adjustment member and engaging the calibration tabon said second lever so that said second adjustment member may beselectively manipulated to deflect said second lever toward or away fromsaid first lever; a generally cup-shaped member having an annular flangearound its exterior, said member being entrapped between said levermembers with the closed end of the cup extending through said secondlever toward said second diaphragm; a first loading spring disposedbetween said cup-shaped member and said first diaphragm and urging saidfirst diaphragm to a position to close said closure member with respectto said third passage and urging said cup-shaped member toward aposition wherein the flange thereon engages said second lever; a second,substantially lighter spring intermediate said cup-shaped member andsaid second diaphragm and normally urging said second diaphragm awayfrom the cupshaped member; and a restricted fluid passage adapted toconnect said timing chamber to an area supplied with fluid pressure onlyduring operation of the main valve in an open position so that, uponinitial opening of the main valve, the exhaust valves opens in responseto outlet pressure effective to overcome the loading on said firstdiaphragm which is determined by the setting of said first adjustmentmember to cause outlet pressure regulation at a first pressure leveland, after a time delay determined by the size of the restriction insaid restricted passage means, the pressure in said timing chamberbecomes sufficient to overcome said second spring and moves said seconddiaphragm into engagement with said cup-shaped member and thereby movessaid cup-shaped member so that said flange thereon abuts said firstlever and addition ally loads said first diaphragm so that said exhaustvalve opens only in response to a second relatively greater outletpressure determined by the position of said second adjustment member andcauses a step operation by the main valve and regulation at said secondpressure.

2. The exhaust valve of claim 1 wherein means is associated with saidsecond diaphragm for selective operation to render said second diaphragminoperative to additionally load said first diaphragm after said timedelay so that the valve operates continuously at said first pressure.

3. A pressure responsive exhaust valve for use in controlling the bleedfrom the control chamber of a main valve of the type having a mainclosure member biased to a closed position and a movable wall responsiveto pressure in the control chamber to open the closure member, theexhaust valve comprising: a body having an operating chamber and atiming chamber therein, said chambers having first and second movablewalls, respectively, each of said movable walls having one side exposedto fluid pressure in the corresponding chamber and the other sideexposed to an area of low pressure; first fluid passage means adapted toconnect said operating chamber to the outlet of the main valve; secondfluid passage means adapted to connect said operating chamber to thecontrol chamber; an exhaust valve closure member associated with saidsecond passage means and operably connected to said first movable walland operable thereby to control fluid flow through said second fluidpassage means, fluid pressure in said operating chamber urging saidfirst movable wall in a direction to open said exhaust valve member; apair of spaced lever members cantilevered on said body; a firstadjustment member threaded into said body and engaging the first of saidlevers so that the first adjustment member may be selectivelymanipulated to deflect said first adjustment member toward or away fromthe second of said levers; a second adjustment member, similar to saidfirst adjustment member and engaging said second lever so that saidsecond adjustment member may be selectively manipulated to deflect saidsecond lever toward or away from said first lever; a spring engagingmember disposed between said lever members and movable therebetween andoperably engageable by said second movable wall upon application offluid pressure to said timing chamber; a first loading spring operablyconnected to said engaging member and to said first movable wall andyieldably urging said first movable Wall to close said valve member andurging said engaging member into abutment with said second lever; asecond, substantially lighter spring intermediate said engaging memberand said second movable wall and normally urging said second movablewall away from operative engagement with said engaging member; and arestricted fluid passage adapted to connect said timing chamber to anarea supplied with fluid pressure only during operation of the mainvalve to an open position so that upon initial opening of the mainvalve, the exhaust valve opens in response to a first outlet pressure onsaid first movable wall effective to overcome the loading thereon whichis determined by the setting of said first adjustment member to causeoutlet pressure regulation at said first pressure, and, after a timedelay determined by the size of the restriction in said restrictedpassage means, the pressure in said timing chamber becomes sufficient toovercome said second spring and moves said second movable Wall intooperative engagement with said engaging member and moves said engagingmember so that it abuts said first lever and thereby additionally loadssaid first movable wall so that said exhaust valve opens only inresponse to a second relatively greater outlet pressure determined bythe position of said second adjustment member and causes a step by themain valve and regulation at said second pressure.

4. An exhaust valve for use in controlling the bleed from the pressurechamber of a main valve of the type having a main closure memberoperated in response to the pressure in the pressure chamber, theexhaust valve comprising: a body having a void therein; a pair ofspaced, generally parallel diaphragms disposed in said void and dividingit into an operating chamber and a timing chamber on opposite sides ofsaid diaphragms and a central chamber intermediate said diaphragms;first passage means connecting said central chamber to atmosphere;second fluid passage means adapted to connect said operating chamber tothe outlet of the main valve; third fluid passage means adapted toconnect said operating chamber to the control chamber; an exhaust valveclosure member in said operating chamber, operably engaged by said firstdiaphragm and normally urged thereby, in opposition to pressure in saidoperating chamber, to a position to close said third passage means; apair of spaced generally parallel lever members mounted on said body insaid central chamber and extending generally parallel to saiddiaphragms; a spring engaging member disposed between said lever membersand movable there between; a first loading spring yieldably urging saidfirst diaphragm to a position to close said closure member and urgingsaid spring engaging member toward said second lever; a second,substantially lighter, spring normally urging said second diaphragm awayfrom the spring engaging member; and a restricted fluid passage adaptedto connect said timing chamber to an area supplied with fluid pressureonly when pressure is applied to the pressure chamber of the main valveso that, upon initial opening of the main valve, the exhaust valve opensin response to outlet pressure effective to overcome the loading by saidfirst spring and, after a time delay determined by the size of therestriction in said restricted passage, the pressure in said timingchamber overcomes said second spring and moves said second diaphragminto engagement with said spring engaging member and additionally loadssaid first diaphragm so that said exhaust valve opens only in responseto a second relatively greater outlet pressure.

5. An exhaust valve for use in controlling the bleed from the pressurechamber of a main valve of the type having a main closure memberoperated in response to pressure in the pressure chamber, the exhaustvalve comprising: a body having an operating chamber and a timingchamber therein, said chambers having first and second movable walls,respectively, each of said movable Walls having one side exposed tofluid pressure in the corresponding chamber and the other side exposedto an area of low pressure; first fluid passage means adapted to connectsaid operating chamber to the outlet of the main valve; second fluidpassage means adapted to connect said operating chamber to the pressurechamber; an exhaust valve closure member associated with said secondpassage means and operable by said first movable wall to control fluidflow through said second fluid passage means, fluid pressure in saidoperating chamber urging said first movable wall in a direction to opensaid exhaust valve member; a pair of lever members mounted on said body;a spring-engaging member disposed between said lever members and movabletherebetween and operably engageable by said second movable wall; afirst loading spring disposed between said engaging member and saidfirst movable wall and urging said first movable wall to a position toclose said exhaust valve member and urging said engaging member intoabutment with said second lever; a second, substantially lighter, springintermediate said engaging member and said second movable wall andnormally urging said second movable wall away from operative engagementwith said engaging member; and a restricted fluid passage adapted toconnect said timing chamber to an area normally at a relatively lowpressure incapable of moving said second movable wall in opposition tosaid second spring and supplied with a higher pressure suflicient toovercome said second spring only when the main valve is operated to itsopen position so that, upon initial opening of the main valve, theexhaust valve opens in response to a first outlet pressure on said firstmovable wall and, after a time delay determined by the size of therestriction. in said restricted passage means, the pressure in saidtiming chamber overcomes said second spring and moves said secondmovable wall into operative engagement with said engaging member andmoves said engaging member into abutment with said first lever toadditionally load said first movable wall so that said exhaust valveopens only in response to a second relatively greater outlet pressure.

6. The exhaust of claim 5 wherein there is associated with said secondmovable wall, means selectively operable to render said second movablewall inoperative to additionally load said first movable wall after saidtime delay so that the valve operates continuously at said firstpressure.

'7. A pressure responsive exhaust valve comprising: a body having anoperating chamber and a timing chamber therein, said chambers havingfirst and second movable walls, respectively, each of said movable wallshaving one side exposed to fluid pressure in the corresponding chamberand the other side exposed to an area of low pressure, said body havinga valve port in said operating chamber; a valve closure member operableby said first movable wall to control fluid flow through said port,fluid pressure in said operating chamber urging said first movable wallin a direction to open said closure member; a pair of spaced levermembers mounted on said body and spaced from said first movable wall;manual adjustment means associated with said levers and selectivelymovable in said body to adjust the position of said levers with respectto each other and with respect to said first movable wall; a springengaging member disposed between said lever members and movabletherebetween; a first loading spring between said engaging member andsaid first movable wall, urging said first movable wall to a position toclose said closure member and urging said engaging member into abutmentwith said second lever; a second, substantially lighter, spring normallyurging said second movable wall away from operative engagement with saidengaging member; a restricted fluid passage adapted to connect saidtiming chamber to an area supplied with fluid pressure whenever pressureis applied to said operating chamber so that, upon initial applicationof pressure to said operating chamber, the closure member opens inresponse to a first pressure on said first movable wall effective toovercome the loading thereon determined by the position of said secondlever, and, after a time delay determined by the size of the restrictionin said restricted passage, the pressure in said timing chamberovercomessaid second spring and moves said second movable wall intooperative engagement with said engaging member and thereby additionallyloads said first movable wall so that said exhaust valve opens only inresponse to a second relatively greater pressure determined by theposition of said first lever.

8. The exhaust valve of claim 7 wherein there is associated with saidsecond movable wall, means selectively operable to render said secondmovable wall inoperative to additionally load said first movable wallafter said time delay so that the valve operates continuously at saidfirst pressure.

9. A pressure responsive exhaust valve for use in controlling a mainvalve of the type having an inlet and an outlet, a main closure memberbetween the inlet and outlet and movable between open and closedpositions to control flow therethrough, means biasing the main closuremember to one of those positions, a movable wall operably connected tothe closure member and operable in response to the pressure in a controlchamber to move the closure member toward the other of those positions,a pilot valve operable between a first position wherein it connects thecontrol chamber to the inlet and a second position wherein it connectsthe control chamber to the outlet, the exhaust valve comprising: a bodyhaving an opening therein; first and second movable walls in said bodydividing said opening into three chambers including an operating chamberhaving said first movable wall as one wall thereof, a timing chamberhaving said second movable Wall as one wall thereof and an intermediatechamber between said first and second movable walls; first fluid passagemeans connecting said operating chamber to the control chamber of themain valve; second fluid passage means connecting said operating chamberto the outlet of the main valve; exhaust valve closure means cooperablewith said first fluid passage means to control fluid flow therethrough,said exhaust valve being operably connected to said first movable wall,fluid pressure in said operating chamber urging said first movable walltoward a position wherein said exhaust valve closure means is opened;loading spring means operably engaging said first movable wall to urgeit to a position to close said exhaust valve closure means; lever meansmounted on said body and having a portion movable with respect thereto;spring engaging means operably engaging said loading spring means andbeing movable to vary the loading on said first movable wall, saidspring engaging means being operably associated with said lever meansand positioned accord ing to the position of said movable portion ofsaid lever means, said spring engaging means being operably engageableby said first movable wall; adjustment means operably associated withsaid lever means and manually movable to select the limits of movementof said spring engaging means and thereby the maximum and minimumloading conditions of said first movable wall; yieldable biasing meansnormally urging said second movable wall out of operable engagement withsaid spring engaging means; and third fluid passage means, including atime delay fiow restriction, connecting said timing chamber to an areanormally at a relatively low pressure incapable of moving said secondmovable wall in opposition to said yieldable biasing means and suppliedwith a higher pressure only when the main valve is operated to its openposition so that, upon initial operation, said exhaust valve responds toa pressure corresponding to the minimum loading condition and maintainspressure at the outlet substantially constant at that pressure and,after a time delay due to said restriction, pressure in said timing chamber causes said second movable wall to move said lever to its maximumloading position and said exhaust valve then responds only to asusbtantially greater pressure and maintains the outlet pressuresubstantially constant at said greater pressure.

10. The exhaust valve of claim 9 wherein there is associated with saidsecond movable wall, means selectively operable to render said secondmovable wall inoperative to additionally load said first movable wallafter said time delay so that the valve operates continuously at saidfirst pressure.

11. The exhaust valve of claim 10 wherein the last named means is amanually movable abutment member selectively movable between a firstposition wherein it physically engages said second movable wall andthereby prevents it from moving into operative engagement with saidspring engaging member, so that the valve operates only at said firstpressure, and a second position wherein said abutment member does notinterfere with movement of said second movable wall.

12. The exhaust valve of claim 10 wherein the last named means includesan exhaust passage connecting said timing chamber to atmosphere, andvalve means in said exhaust passage selectively operable between an openposition wherein it connects said timing chamber to atmosphere, so thatpressure does not build up in said timing chamber to move said secondmovable wall into engagement with said spring engaging means, and aclosed position wherein said exhaust passage is blocked.

13. A pressure responsive exhaust valve for use in controlling a mainvalve of the type having an inlet and an outlet, a main closure memberbetween the inlet and outlet and movable between open and closedpositions to control flow therethrough, means biasing the main closuremember to one of those positions, a movable wall operably connected tothe closure member and operable in response to the pressure in a controlchamber to move the closure member toward the other of those positions,a two-position pilot valve operable between a first position wherein itconnects the control chamber to the inlet and a second position whereinit connects the control chamber to the outlet, the exhaust valvecomprising: a body having an opening therein; first and second movablewalls in said body dividing said opening into three chambers includingat atmospheric chamber intermediate said first and second movable walls,an operating chamber having said first movable wall as one Wall thereof,and a timing chamber having said second movable wall as one wallthereof; first fluid passage means connecting said operating chamber tothe control chamber of the main valve; second fluid passage meansconnecting said operating chamber to the outlet of the main valve;exhaust valve closure means cooperable with said first fluid passagemeans to control fluid flow therethrough, said exhaust valve beingoperable connected to said first movable wall, fluid pressure in saidoperating chamber urging said first movable wall toward a positionwherein said exhaust valve closure means is opened; loading spring meansdisposed in said atmospheric chamber and operably engaging said firstmovable wall to urge it to a position to close said exhaust valveclosure means; lever means mounted on said body in said atmosphericchamber and having a portion movable in said chamber; spring engagingmeans disposed in said atmospheric chamber and operably engaging saidloading spring means and being movable with respect thereto to vary theloading on said first movable wall, said. spring engaging means beingoperably associated with said lever means and positioned in said chamberaccording to the position of said movable portion of said lever means;adjustment means operably associated with said lever means and manuallymovable to select the limits of movement of said spring engaging memberand thereby the maximum and minimum loading conditions of said firstmovable wall, said spring engaging means being disposed so that, uponapplication of fluid pressure to said timing chamber, said secondmovable wall operably engages said spring engaging means and moves ittoward its maximum loading position; yieldable biasing means normallyurging said second movable wall out of operable engagement with saidspring engaging means; and third fluid passage means, including a timedelay flow restriction, connecting said timing chamber to an areanormally at a relatively low pressure incapable of moving said secondmovable wall in opposition to said yieldable biasing means and suppliedwith a higher pressure only when the main valve is operated to its openposition so that, upon initial operation, said exhaust valve responds toa pressure corresponding to the minimum loading condition and maintainspressure at the outlet substantially constant at that pressure and,after a time delay due to said restriction, said second movable wallmoves said spring engaging member to its maximum loading position andsaid exhaust valve responds only to a substantially greater pressure andmaintains the outlet pressure substantially constant at said greaterpressure.

14. A pressure responsive exhaust valve for use in controlling a mainvalve of the type having an inlet and an outlet, a main closure memberbetween the inlet and out let and movable between open and closedpositions to control flow therethrough, means biasing the main closuremember to one of those positions, a movable wall operable connected tothe closure member and operable in response to the pressure in a controlchamber to move the closure member toward the other of those positions,a pilot valve operable between a first position wherein it connects thecontrol chamber to the inlet and a second position wherein it connectsthe control chamber to the outlet, the exhaust valve comprising: a bodyhaving an opening therein; first and second movable walls in said bodydividing said opening into three chambers including 13 an operatingchamber having said first movable wall as one wall thereof, a timingchamber having said second movable wall as one wall thereof and anintermediate chamber between said first and second movable walls; firstfluid passage means for connecting said operating chamber to the controlchamber of the main valve; second fluid passage means for connectingsaid operating chamher to the outlet of the main valve; exhaust valveclosure means cooperable with said first fluid passage means to controlfluid flow therethrough, said exhaust valve being operably connected tosaid first movable wall, fluid pressure in said operating chamber urgingsaid first movable wall toward a position wherein said exhaust valveclosure means is opened; loading spring means operably engaging saidfirst movable wall to urge it to a position to close said exhaust valveclosure means; a lever pivotally mounted on said body and including aspring engaging portion operably engaging said loading spring means andmovable to vary the loading on said first movable wall, said lever beingoperably engageable by said second movable wall; adjusting meansincluding abutment means adapted to fix the extent of movement of saidspring engaging portion to determine the maximum and minimum loadingconditions respectively, on said first movable wall; said lever beingdisposed so that, upon application of fluid pressure to said timingchamber, said second movable wall operably engages said lever and movesit toward its maximum loading position; yieldable biasing means normallyurging said second movable wall out of operable engagement with saidspring engaging means; and third fluid passage means, including a timedelay flow restriction, connecting said timing chamber to an areanormally at a relatively low pressure incapable of moving said secondmovable wall in opposition to said yieldable biasing means and suppliedwith a higher pressure only when the main valve is operated to its openposition so that, upon initial operation, said exhaust valve responds toa pressure corresponding to the minimum loading condition and maintainspressure at the outlet substantially constant at that pressure and,after a time delay due to said restriction, said second movable wallmoves said lever to its maximum loading position and said exhaust valveresponds only to a substantially greater pressure and maintains theoutlet pressure substantially constant at said greater pressure.

15. A pressure responsive exhaust valve for use in controlling a mainvalve of the type having an inlet and an outlet, a main closure memberbetween the inlet and outlet and movable between open and closedpositions to control flow therethrough, means biasing the main closuremember to one of those positions, a movable wall operably connected tothe closure member and operable in response to the pressure in a controlchamber to move the closure member toward the other of those positions,a pilot valve operable between a first position wherein it connects thecontrol chamber to the inlet and a second position wherein itconnectsthe control chamber to the outlet, the exhaust valve comprising: a bodyhaving an opening therein; first and second movable walls in said bodydividing said opening into three chambers including an operating chamberhaving said first movable wall as one wall thereof, a timing chamberhaving said second movable wall as one wall thereof and an intermediatechamber between said first and second movable walls; first fluid passagemeans connecting said operating chamber to the control chamber of themain valve; second fluid passage means connecting said operating chamberto the outlet of the main valve; exhaust valve closure means cooperablewith said first fluid passage means to control fluid flow therethrough,said exhaust valve being operably connected to said first movable wall,fluid pressure in said operating chamber urging said first movable walltoward a position wherein said exhaust valve closure means is opened;loading spring means disposed in said atmospheric chamber and operablyengaging said first movable 14 e wall to urge it to a position to closesaid exhaust valv closure means; a first lever member cantilevered onsaid body and extending generally parallel to said first movable wall inthe chamber between said first and second movable walls and having afree end deflectable toward and away from said first movable wall; asecond lever member pivoted on said body in the chamber between saidfirst and second movable walls and having a free end portion movabletoward and away from said first movable wall, said free end portionoperably engaging said loading spring means so that movement toward andaway from said first movable wall is effective to vary the loadingthereon; means providing a lost motion connection between the free endsof said first and second lever members to limit the permissible pivotalmovement of said second lever away from said first lever; firstadjustment means for limiting the deflection of said first lever awayfrom said first movable wall to determine the minimum loading conditionon said first movable wall; second adjustment means cooperable with saidsecond lever to limit its movement toward said first movable wall todetermine the maximum loading condition for said first movable wall;said second lever being disposed so that, upon application of fluidpressure to said timing chamber, said second movable wall operablyengages said second lever and moves it toward its maximum loadingposition; yieldable biasing means normally nrging said second movablewall out of operable engagement with said spring engag ing means; andthird fluid passage means, including a time delay flow restriction,connecting said timing chamber to an area normally at a relatively lowpressure incapable of moving said second movable wall in opposition tosaid yieldable biasing means and supplied with a higher pressure onlywhen the main valve is operated to its open position so that, uponinitial opera-tion, said exhaust valve responds to a pressurecorresponding to the minimum loading condition and maintains pressure atthe outlet substantially constant at that pressure and, after a timedelay due to said restriction, said second movable wall moves saidsecond lever to its maximum loading position and said exhaust valveresponds only to a substantially greater pressure and maintains theoutlet pressure substantially constant at said greater pressure.

16. A pressure responsive exhaust valve comprising: a body having anoperating chamber and a timing chamber therein, said chambers havingfirst and second movable walls, respectively, each of said movable wallshaving one side exposed to fluid pressure in the corresponding chamberand the other side exposed to an area of low pressure, said body havinga valve port in said operating chamber; a valve closure member operableby said first movable wall to control fluid flow through said port,fluid pressure in said operating chamber urging said first movable wallin a direction to open said closure member; loading spring meansoperably engaging said first movable wall to urge it to a position toclose said exhaust valve closure means; lever means mounted on said bodyand having a portion movable with respect thereto; spring engaging meansoperably engaging said loading spring means and being movable to varythe loading on said first movable wall, said spring engaging means beingoperably associated with said lever means and positioned according tothe position of said movable portion of said lever means, said springengaging means being operably engageable by said first movable wall;adjustment means operably assoicated with said lever means and manuallymovable to select the limits of movement of said spring engaging meansand thereby the maximum and minimum loading conditions of said firstmovable wall; yieldable biasing means normally urging said secondmovable wall out of operable engagement with said spring engaging means;and a restricted fluid passage adapted to connect said timing chamber toan area supplied with fluid pressure whenever pressure is applied tosaid operating chamber so that upon initial application of pressure tosaid operating chamber, the closure means opens in response to a firstpressure on said first movable wall effective to overcome the loadingthereon corresponding to said minimum loading condition, and, after atime delay determined by the size of the restriction in said restrictedpassage, the pressure in said timing chamber overcomes said yieldablebiasing means and moves said second movable wall into operativeengagement with said spring engaging means and thereby moves said springengaging means to its maximum loading position so that said exhaustvalve opens only in response to a second relatively greater pressure.

17. The exhaust valve of claim 16 wherein there is associated with saidsecond movable wall, means selectively operable to render said secondmovable wall inoperative to additionally load said first movable wallafter said time delay so that the valve operates continuously at saidfirst pressure.

No references cited.

M. CARY NELSON, Primary Examiner.

10 R. J. MILLER, Assistant Examiner.

1. A PRESSURE RESPONSIVE EXHAUST VALVE FOR USE IN CONTROLLING A MAINVALVE OF THE TYPE HAVING A MAIN CLOSURE MEMBER BIASED TO A CLOSEDPOSITION, A CONTROL CHAMBER INCLUDING A MOVABLE WALL OPERABLY CONNECTEDTO THE MAIN CLOSURE MEMBER AND RESPONSIVE TO PRESSURE IN THE CONTROLCHAMBER TO OPEN THE CLOSURE MEMBER, AND CONTROL VALVE MEANS OPERABLE TOA FIRST POSITION TO CONNECT THE CONTROL CHAMBER TO PRESSURE AT THE INLETOF THE MAIN VALVE TO CAUSE OPENING OF THE MAIN CLOSURE MEMBER, ANDOPERABLE TO A SECOND POSITION TO CONNECT THE CONTROL CHAMBER TO THEOUTLET OF THE MAIN VALVE TO CAUSE CLOSURE OF THE MAIN CLOSURE MEMBER,THE EXHAUST VALVE COMPRISING: A BODY HAVING A VOID THEREIN; A PAIR OFSPACED, GENERALLY PARALLEL DIAPHRAGMS DISPOSED IN SAID VOID AND DIVIDINGIT INTO AN OPERATING CHAMBER BETWEEN THE FIRST OF SAID DIAPHRAGMS ANDSAID BODY AND A TIMING CHAMBER BETWEEN THE SECOND OF SAID DIAPHRAGMS ANDSAID BODY, AND A CENTRAL CHAMBER INTERMEDIATE SAID DIAPHRAGMS; FIRSTFLUID PASSAGE MEANS INCLUDING A FLOW RESTRICTION AND CONNECTING SAIDCENTRAL CHAMBER TO ATMOSPHERE; SECOND FLUID PASSAGE MEANS ADAPTED TOCONNECT SAID OPERATING CHAMBER TO THE OUTLET OF THE MAIN VALVE; THIRDFLUID PASSAGE MEANS ADAPTED TO CONNECT SAID OPERATING CHAMBER TO THECONTROL CHAMBER; AN EXHAUST VALVE CLOSURE MEANS COOPERABLE WITH SAIDTHIRD FLUID PASSAGE TO CONTROL FLUID FLOW THERETHROUTH, SAID CLOSUREMEMBER BEING OPERABLY ENGAGED BY SAID FIRST DIAPHRAGM AND NORMALLY URGEDTHEREBY TO A POSITION TO CLOSE SAID THIRD PASSAGES MEANS, SAID FIRSTDIAPHRAGM BEING RESPONSIVE TO FLUID PRESSURE IN SAID OPERATING CHAMBERFOR MOVEMENT TOWARD SAID CENTRAL CHAMBER TO ALLOW SAID CLOSURE MEMBER TOOPEN SAID THIRD PASSAGE MEANS; A PAIR OF SPACED GENERALLY PARALLEL LEVERMEMBER CANTILEVERED ON SAID BODY IN SAID CENTRAL CHAMBER AND EXTENDINGGENERALLY PARALLEL TO SAID DIAPHRAGMS, SAID LEVELS HAVING A PAIR OFALIGNED APERTURES THERETHROUGH, EACH OF SAID LEVERS HAVING A CALIBRATIONTAB EXTENDING THEREFROM AT AN ACUTE ANGLE TO SAID LEVERS; A FIRSTADJUSTMENT MEMBER THREADED INTO SAID BODY AND EXTENDING INTO SAIDCENTRAL CHAMBER GENERALLY PARALLEL TO SAID LEVERS AND ENGAGING THECALIBRATION TAB ON THE FIRST OF SAID LEVERS SO THAT SAID ADJUSTMENTMEMBER MAY BE SELECTIVELY MANIPULATED TO DEFLECT SAID FIRST LEVER TOWARDOR AWAY FROM THE SECOND OF SAID LEVERS; A SECOND ADJUSTMENT MEMBER,SIMILAR TO SAID FIRST ADJUSTMENT MEMBER AND ENGAGING THE CALIBRATION TABON SAID SECOND LEVER SO THAT SAID SECOND ADJUSTMENT MEMBER MAY BESELECTIVELY MANIPULATED TO DEFLECT SAID SECOND LEVER TOWARD OR AWAY FROMSAID FIRST LEVER; A GENERALLY CUP-SHAPED MEMBER HAVING AN ANNULAR FLANGEAROUND ITS EXTERIOR, SAID MEMBER BEING ENTRAPPED BETWEEN SAID LEVERMEMBERS WITH THE CLOSED END OF THE CUP EXTENDING THROUGH SAID SECONDLEVER TOWARD SAID SECOND DIAPHRAGM; A FIRST LOADING SPRING DISPOSEDBETWEEN SAID CUP-SHAPED MEMBER AND SAID FIRST DIAPHRAGM AND URGING SAIDFIRST DIAPHRAGM TO A POSITION TO CLOSE SAID CLOSURE MEMBER WITH RESPECTTO SAID THIRD PASSAGE AND URGING SAID CUP-SHAPED MEMBER TOWARD APOSITION WHEREIN THE FLANGE THEREON ENGAGES SAID SECOND LEVER; A SECOND,SUBSTANTIALLY LIGHTER SPRING INTERMEDIATE SAID CUP-SHAPED MEMBER ANDSAID SECOND DIAPHRAGM AND NORMALLY URGING SAID SECOND DIAPHRAGM AWAYFROM THE CUP-